BUG REPORT: Bluetooth bug in Venu 3 and Vivoactive 5 firmware

I am a developer of the "Kite WOO+GPS" app. It connects to the kitesurfing sensor (called WOO) via Bluetooth. We received reports from Venu 3 and Vivoactive 5 users that their watch doesn't connect to the sensor. I bought both models and traced the issue to this Bluetooth implementation bug in firmware on these watch models (all other watch models work fine at the moment).

Just to reinforce, it works on all watches except Venu 3 and Vivoactive 5 (also FR165 was not tested yet). In simulator it works, but not on the real watches.

The initial Bluetooth scan and pairing goes as usual, no issues until the app calls:

descriptor.requestWrite(DESCRIPTOR_ENABLE_NOTIFICATION);

After that, the Bluetooth call back never executed:

function onDescriptorWrite(desc, status)

not called. I tried a workaround (proceed without the call back), but the following characteristic.requestWrite fails (throws exception), so workaround is not possible.

Please review and let me know. I can test a beta firmware for Venu 3.