I removed all devices from GadgetBridge and Bangle.js, then added a new device to the whitelist again and also did it with pairing in GadgetBridge (it worked after some tries).
Now, as long as I'm still in the settings menu on Bangle.js, the reconnection works reliably.
When I go back to the clock app (Bangle.js reboots for that), the existing connection still works but any following disconnect/reconnect fails.
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Ok, some additional tests:
I removed all devices from GadgetBridge and Bangle.js, then added a new device to the whitelist again and also did it with pairing in GadgetBridge (it worked after some tries).
Now, as long as I'm still in the settings menu on Bangle.js, the reconnection works reliably.
When I go back to the clock app (Bangle.js reboots for that), the existing connection still works but any following disconnect/reconnect fails.