🐞Turning on "Force Autoplay Off" prevents youtube videos from playing at all

Concise Description

Toggling "Force Autoplay Off" to "on" breaks all youtube videos; they do not start at all. Reloading the page, logging out of my account, or trying to access the video through a private tab makes no difference.

Once, I toggled the setting to "on" in the middle of a video, and in this one case the video kept playing, but when it reached the end, it autoplayed the next video. So the purpose of the setting also failed in this instance.

I only experience this issue in Mobile Firefox (Nightly version). I haven't tested the non-Nightly Mobile version, but I doubt that's the problem, in part because this has been an problem for a while now, and in part because I saw a similar report from someone who uses Chrome.

This issue does not occur for me in the desktop version of Firefox (non-nightly, on Windows 10, 64 bit).

More or less related issues include:
"Force Autoplay Off not working #3087"
and
""Toggling Force Autoplay Off to on prevent the video from playing #2919""

Browser/s

Firefox

Other Browser:

Mobile Firefox Nightly, specifically.

'Steps to reproduce' - Which of our features is required for the bug to happen?

Go to settings, then "Player", then toggle "Force Autoplay Off" to "On". May potentially only occur in a mobile browser.

Since when?

I'm not sure, but for months at least. It's been a problem for me since I started trying to use the extension.

Does the bug still happen when you log out of YouTube?

Yes

..No? Then please paste your yt.config_.EXPERIMENT_FLAGS. Twice (With the error & Without)

No response

Are any errors or related log-messages shown in the Browser-Console? (F12)

No response

Tested as the only active extension? (incognito mode or another browser users):

Yes

Expected preferred behavior:

Toggling "Force Autoplay Off" to "On" should prevent autoplay but NOT prevent regular play triggered by the user clicking/tapping on the play button.

ImprovedTube Version

Version: 4.1325

Your Settings (From the Extension's ⋮-Hamburger menu > Settings > Backup & reset > Export settings)

Inaccessible - I went to "Backup & reset", granted the download permissions, and attempted to export my settings, but the extension froze/crashed after I pressed the "Ok" button on the confirmation dialog. Then I tried reloading and trying a second time, and I got the exact same freeze at the same place. Couldn't export the settings.

Your YouTube-Document

No response

OS / Device:

Name: Android
Bitness: 32-bit
Name: Firefox
Version: 145.0
Platform: Linux armv81
Audio formats: mp3, mp4, AAC-LC, opus
Video formats: H.264 Baseline Profile 3.0, H.264 Main Profile 4.0, vp9, av1
Java: false
Cookies: false

No response

Start in Settings > Player by reproducing the "Force Autoplay Off" behavior on Mobile Firefox Nightly, then trace the player autoplay handling used when a video is tapped. Check the related issues #3087 and #2919 for context. Done means user-triggered playback works while autoplay remains disabled, including after a video ends.