pygmt: Wrong point location in inset

Description of the problem

When plotting a point in an inset, it is drawn in the wrong geographic location.

Full code that generated the error

import pygmt

region = [-117.628, -117.478, 35.605, 35.801]
fig = pygmt.Figure()
pygmt.makecpt(
    cmap='etopo1',
    series='0/2800/200',
    continuous=True
)
topo_data = "@earth_relief_01s"
fig.grdimage(
    grid=topo_data,
    region=region,
    projection='M4i',
    shading=True,
    frame=True
)

with fig.inset(position="jTR+w3c", box="+pblack"):
    # Use a plotting function to create a figure inside the inset
    fig.coast(
        region=[-125, -110, 30, 45],
        projection="M3c",
        land="gray",
        borders=[1, 2],
        shorelines="1/thin",
        water="white"
    )
    fig.plot(x=-117.55, y=35.7, size=[0.2], style="c", color="black")
fig.show()

System information

Please paste the output of python -c "import pygmt; pygmt.show_versions()":

PyGMT information: version: v0.6.0 System information: python: 3.10.0 (tags/v3.10.0:b494f59, Oct 4 2021, 19:00:18) [MSC v.1929 64 bit (AMD64)] executable: C:\Users\eyals\AppData\Local\Programs\Python\Python310\python.exe machine: Windows-10-10.0.19044-SP0 Dependency information: numpy: 1.21.2 pandas: 1.3.3 xarray: 0.19.0 netCDF4: 1.5.7 packaging: 21.0 ghostscript: 9.54.0 gmt: 6.3.0 GMT library information: binary dir: C:/Users/eyals/AppData/Local/Programs/Python/Python310 cores: 4 grid layout: rows library path: c:/programs/gmt6/bin/gmt_w64.dll padding: 2 plugin dir: c:/programs/gmt6/bin/gmt_plugins share dir: c:/programs/gmt6/share version: 6.3.0