Is 1.15.2 or 1.15.3 with web_server compatible with a Sonoff Basic?

I have several Sonoff Basic running 1.15.1. They work fine.

I upgraded one of them to 1.15.3 → still OK.

I then added to another one on 1.15.1 the entry web_server and upgraded it to 1.15.3. That is the configuration that is problematic.

This device was flashed correctly, rebooted but does not connect to my WiFi anymore. Its led blinks continuously (as if it was looking for the network).

The fallback AP does not start.

The physical button works (the switch switches).

Has anyone that combination working: Sonoff Basic + web_server + 1.15.3?

(I tested this on two different Sonoff Basics that are now bricked (in the sense that I will probably have to reflash them manually))

Note: I opened a GitHub Issue about that (https://github.com/esphome/issues/issues/1688) but no information so far.