v2.20 fails to hold stable debugging connection with probe-run

[ctron]

Using https://github.com/knurling-rs/probe-run to flash firmware and run debugging works as expected for the micro:bit v2 (.00).

But it starts failing with the micro:bit .20.

Having the interface version 0256 is breaks after a bit with:

RTT error: Error communicating with probe: A core architecture specific error occurred
────────────────────────────────────────────────────────────────────────────────
Error: A core architecture specific error occurred

Caused by:
    0: Failed to read register DRW at address 0x0000000c
    1: An error specific to a probe type occurred
    2: Error handling CMSIS-DAP command Transfer
    3: Timeout in USB communication.

Ignore: probably some issue with flashing the firmware

Upgrading to the 0257 firmware it gets even worse:

(HOST) INFO  flashing program (35 pages / 140.00 KiB)
(HOST) INFO  success!
Error: An error with the usage of the probe occurred

Caused by:
    Operation timed out

[ctron]

I updated the original comment, as it looks like the upgrade to 0257 just somehow failed. Re-trying this a few times, I end up with 0257 behaving the way as 0256.

[ctron]

It looks like using cargo embed (0.13.0) instead of probe-run works.

[ctron]

cargo-embed faces the same (I guess) issue, but takes longer to reach this point. Instead of 5-30 seconds to break, the connection runs for around 15mins.