appium: xpath selector doesn't work if search context is an element (not a driver)

driver.find_element(:xpath, '//UIATableView[1]')

Appium log:

debug: Appium request initiated at /wd/hub/session/43dc50b4-a81b-4ec0-9f00-add2ea9b4e38/element
debug: Request received with params: {"using":"xpath","value":"//UIATableView[1]"}
info: Pushing command to appium work queue: "au.mainApp().getTreeForXML()"
debug: Sending command to instruments: au.mainApp().getTreeForXML()
info: [INSTSERVER] Sending command to instruments: au.mainApp().getTreeForXML()
info: [INSTSERVER] Socket data received (8186 bytes)
info: [INSTSERVER] Socket data received (8192 bytes)
info: [INSTSERVER] Socket data received (5420 bytes)
info: [INSTSERVER] Socket data being routed for 'cmd' event
info: [INSTSERVER] Got result from instruments: {"status":0,"value":"{\"UIAApplication\":{\"@\":{\"name\":\"Podio\",\"label\":\"Podio\",\"value\":null,\"dom\":null,\"enabled\":true,\"valid\":true,\"visible\":true,\"hint\":null,\"path\":\"/0\",\"x\":0,\"y\":20,\"width\":320,\"height\":548},\">\":[{\"UIAWindow\":{\"@\":{\"name\":null,\"label\":null
info: Pushing command to appium work queue: "au.getElementByIndexPath('/0/0/3')"
debug: Sending command to instruments: au.getElementByIndexPath('/0/0/3')
info: [INSTSERVER] Sending command to instruments: au.getElementByIndexPath('/0/0/3')
info: [INSTSERVER] Socket data received (62 bytes)
info: [INSTSERVER] Socket data being routed for 'cmd' event
info: [INSTSERVER] Got result from instruments: {"status":0,"value":{"ELEMENT":"48"}}
info: Responding to client with success: {"status":0,"value":{"ELEMENT":"48"},"sessionId":"43dc50b4-a81b-4ec0-9f00-add2ea9b4e38"}
POST /wd/hub/session/43dc50b4-a81b-4ec0-9f00-add2ea9b4e38/element 200 619ms - 110b

Then trying to do search for table cell inside a UIATableView using chained queries.

driver.find_element(:xpath, '//UIATableView[1]').find_element(:xpath, '//UIATableCell[1]/UIAElement[1]').text

And the log is:

debug: Appium request initiated at /wd/hub/session/43dc50b4-a81b-4ec0-9f00-add2ea9b4e38/element
debug: Request received with params: {"using":"xpath","value":"//UIATableView[1]"}
info: Pushing command to appium work queue: "au.mainApp().getTreeForXML()"
debug: Sending command to instruments: au.mainApp().getTreeForXML()
info: [INSTSERVER] Sending command to instruments: au.mainApp().getTreeForXML()
info: [INSTSERVER] Socket data received (8186 bytes)
info: [INSTSERVER] Socket data received (8192 bytes)
info: [INSTSERVER] Socket data received (5420 bytes)
info: [INSTSERVER] Socket data being routed for 'cmd' event
info: [INSTSERVER] Got result from instruments: {"status":0,"value":"{\"UIAApplication\":{\"@\":{\"name\":\"Podio\",\"label\":\"Podio\",\"value\":null,\"dom\":null,\"enabled\":true,\"valid\":true,\"visible\":true,\"hint\":null,\"path\":\"/0\",\"x\":0,\"y\":20,\"width\":320,\"height\":548},\">\":[{\"UIAWindow\":{\"@\":{\"name\":null,\"label\":null
info: Pushing command to appium work queue: "au.getElementByIndexPath('/0/0/3')"
debug: Sending command to instruments: au.getElementByIndexPath('/0/0/3')
info: [INSTSERVER] Sending command to instruments: au.getElementByIndexPath('/0/0/3')
info: [INSTSERVER] Socket data received (62 bytes)
info: [INSTSERVER] Socket data being routed for 'cmd' event
info: [INSTSERVER] Got result from instruments: {"status":0,"value":{"ELEMENT":"49"}}
info: Responding to client with success: {"status":0,"value":{"ELEMENT":"49"},"sessionId":"43dc50b4-a81b-4ec0-9f00-add2ea9b4e38"}
POST /wd/hub/session/43dc50b4-a81b-4ec0-9f00-add2ea9b4e38/element 200 561ms - 110b
debug: Appium request initiated at /wd/hub/session/43dc50b4-a81b-4ec0-9f00-add2ea9b4e38/element/49/element
debug: Request received with params: {"using":"xpath","value":"//UIATableCell[1]/UIAElement[1]"}
info: Pushing command to appium work queue: "au.getElement('49').getTreeForXML()"
debug: Sending command to instruments: au.getElement('49').getTreeForXML()
info: [INSTSERVER] Sending command to instruments: au.getElement('49').getTreeForXML()
info: [INSTSERVER] Socket data received (2605 bytes)
info: [INSTSERVER] Socket data being routed for 'cmd' event
info: [INSTSERVER] Got result from instruments: {"status":0,"value":"{\"UIATableView\":{\"@\":{\"name\":null,\"label\":null,\"value\":\"rows 1 to 3 of 3\",\"dom\":null,\"enabled\":true,\"valid\":true,\"visible\":true,\"hint\":null,\"path\":\"/0\",\"x\":0,\"y\":64,\"width\":320,\"height\":504},\">\":[{\"UIATableCell\":{\"@\":{\"name\":\"All Field 
info: Pushing command to appium work queue: "au.getElementByIndexPath('/0/0/1')"
debug: Sending command to instruments: au.getElementByIndexPath('/0/0/1')
info: [INSTSERVER] Sending command to instruments: au.getElementByIndexPath('/0/0/1')
info: [INSTSERVER] Socket data received (62 bytes)
info: [INSTSERVER] Socket data being routed for 'cmd' event
info: [INSTSERVER] Got result from instruments: {"status":0,"value":{"ELEMENT":"50"}}
info: Responding to client with success: {"status":0,"value":{"ELEMENT":"50"},"sessionId":"43dc50b4-a81b-4ec0-9f00-add2ea9b4e38"}
POST /wd/hub/session/43dc50b4-a81b-4ec0-9f00-add2ea9b4e38/element/49/element 200 282ms - 110b
debug: Appium request initiated at /wd/hub/session/43dc50b4-a81b-4ec0-9f00-add2ea9b4e38/element/50/text
debug: Request received with params: {}
info: Pushing command to appium work queue: "au.getElement('50').text()"
debug: Sending command to instruments: au.getElement('50').text()
info: [INSTSERVER] Sending command to instruments: au.getElement('50').text()
info: [INSTSERVER] Socket data received (102 bytes)
info: [INSTSERVER] Socket data being routed for 'cmd' event
info: [INSTSERVER] Got result from instruments: {"status":0,"value":"UH OH! LOADING FAILED, CHECK YOUR INTERNET CONNECTION."}
info: Responding to client with success: {"status":0,"value":"UH OH! LOADING FAILED, CHECK YOUR INTERNET CONNECTION.","sessionId":"43dc50b4-a81b-4ec0-9f00-add2ea9b4e38"}
GET /wd/hub/session/43dc50b4-a81b-4ec0-9f00-add2ea9b4e38/element/50/text 200 118ms - 141b

It seems like this query is not built correctly:

au.getElementByIndexPath('/0/0/1')

Instead, it should be:

au.getElementByIndexPath('/0/0/3/0/1') 

Note: running from sources d9f0ae7d718e06959854b9b1d3a23306adbee212