angular-auth-oidc-client: Silent Renew - Renew stops checking token timestamps

Env

• We are using version 11.2.1
• Angular 10.2
• rxjs 6.6.3
• Typescript 4.0.3
• Implicit flow
• There are no errors in the browser Console
• There are no errors in browser Network
• There are no errors from the STS (IDS4)

Issue

1. Silent renew runs once and the tokens are renewed
2. No errors on the STS console
3. Subsequent checks skip the check for expiry

First time silent renew compares the timestamp:-

Checking: silentRenewRunning: false id_token: true userData: true
Has id_token expired: false, 1603536078000 > 1603535806261
Has access_token expired: false, 1603535811129 > 1603535806262
silent renew finished!

Timestamps show token expired - Renew works fine and there are no errors on the STS console (IDS4)

Checking: silentRenewRunning: false id_token: true userData: true
Has id_token expired: false, 1603536078000 > 1603535812263
Has access_token expired: true, 1603535811129 > 1603535812263
starting silent renew...
BEGIN refresh session Authorize Iframe renew
RefreshSession created. adding myautostate:  Array [ "f9b21f51375da50cfbdffbfc8a808c6b10MFtZrqx" ]
....
STS server: http://an.ip.address
currentUrl to check auth with:
....
BEGIN authorizedCallback, no auth data
history clean up inactive
Object { id_token: 
....
removed event listener from IFrame
authorizedCallback created, begin token validation
Getting signinkeys from Array [ "http://an.ip.address/.well-known/openid-configuration/jwks" ]
silent renew finished!

Then subsequent silent renews don’t check the timestamps

Checking: silentRenewRunning: false id_token: true userData: true
silent renew finished!

Digging deeper

The key value for myClientName_storageSilentRenewRunning is not being reset after the tokens are renewed. But manually setting this key value to something other than running makes the silentRenew check the timestamps again.

IE this code doesn’t return null anymore and the timestamp evaluation runs:-

            const shouldBeExecuted = userDataFromStore && !isSilentRenewRunning && idToken;
            if (!shouldBeExecuted) {
                return of(null);
            }

After the refresh In the code (around 2900)

            .subscribe(() => {
            this.loggerService.logDebug('silent renew finished!');
            if (this.flowHelper.isCurrentFlowCodeFlowWithRefeshTokens()) {
                this.flowsDataService.resetSilentRenewRunning();
            }

resetSilentRenewRunning is not being called so the key value isn’t updated from “running”

In the config the default value for useRefreshToken is false. Is this why below code returns false?

this.flowHelper.isCurrentFlowCodeFlowWithRefeshTokens()

Some help on this please would be great Thanks in advance, Nigel.