Connecting over USB puts CircuitPlayground Bluefruit in REPL, but doesn't show this in the console.

[gallaugher]

CircuitPython Version

CircuitPython 10.0.3, CircuitPlayground Bluefruit, Chrome running on macOS 26.

Workflow(s)

USB

Browser(s)

Chrome is up to date
Version 143.0.7499.170 (Official Build) (arm64)

Console Log

Steps

I'm prepping the first class lesson & notice that if I have a CircuitPlayground Bluefruit with a fresh version of CircuitPython (I've got 10.0.3 on the board), and I go to code.circuitpython.org and connect over USB, all 10 neopixel lights on the board light up in white as if I'm in the REPL. When I open an existing code file (Open button, code.py), then make changes and save, it remains in this "all white lights REPL mode", even though the serial console doesn't show it as being in REPL, nor does it show any output as expected - It just shows the Device ID & "Connected", as it did after I connected to the board.
Is this a bug or is there a specific procedure I should be using?
It does seem like "Save + Run" does work properly, getting me out of REPL all white lights mode, executing code, and showing results in the console, but I the workflow I'm describing isn't what's wanted.
For example, if I enter some updates, then select "Save" instead of "Save + Run" after the "Save + Run" above, I get the expected result - the code reruns, and I see the results in the console.
FYI: Here is the code, nothing special about it. Just two print statements:
print("CircuitPython is cool!")
print("You are becoming a coding legend!")

Description

See above

Additional information

No response

[makermelissa]

Thanks for letting us know. At this time, bluetooth isn't working so well. See https://github.com/circuitpython/web-editor/issues?q=is%3Aissue%20state%3Aopen%20label%3A%22BLE%20Workflow%22

[gallaugher]

Thanks. Sorry if this wasn't clear. It's something that shows up on both CPX and CPB over USB. Here is what I posted to Discord, which I hope is more clear:
Repeated saves after the "Save + Run" seem to execute properly, nothing triggers the REPL mode. Issue is that the board is getting into REPL mode as soon as USB is clicked to setup the workflow, but it doesn't show this at all in the web editor's console output. It just shows "Connected". You can open a file, edit, and save (still with all white lights on), and the user never gets out of all white lights REPL mode, but there's no indication of being in REPL model in the console.
Simply connecting, opening code.py, and editing / saving does NOT execute code / get someone out of all white lights REPL mode, even though there's no REPL shown in the console, and any red "you've made a change" indicator for the /code.py volume listed above the editor pane turns from red to black after the save. So it suggests save works, but not execution, we're stuck in a REPL mode that the user didn't request to get into and that's not shown in the console output.
I also tried this on a CPX. Same exact issue.
Do note that if the user clicks "Save + Run" (not just save) then the REPL mode is executed (white lightsh go away, CPB flashes like a restart) and the code executes, with output showing in the console.
Also - clicking the "Reset" button on the Web Editor above the console (not the button on the board itself) seems to also eecute the last code saved. Any "Save" button presses after this seem to execute fine, no faulty REPL traps.
I also tried things with PyCharm & didn't notice any similar issue. I was able to oopen code.py, make changes, and have these execute right away. I did the PyCharm test without running in Tio to make sure Tio didn't impact things - to verify code worked, I edited & saved print statements (code executed, flashing green light to show it was done), then deleted those statements from code.py & entered simple code to turn on all the board's NEOPXIEL lights to blue and added a while true. Saving turned the lights blue, as expected. Never a REPL.