It may be that a common issue with the Plymouth boot screen (the three dots) has inadvertently been triggered.
Plymouth isn’t needed for booting Manjaro. Many users (myself included) remove it completely even if it isn’t causing issues; because, sooner or later, it will. Because Plymouth has close ties to boot processes, simply uninstalling the package is insufficient.
The correct procedure to remove Plymouth can be found on the Manjaro Plymouth Wiki page under the heading of REMOVAL. Please also see related information found in Disable or Remove Plymouth (boot splash).
It’s possible that this may not directly solve your issue. It will, at least, take Plymouth out of the equation as being a contributor to the problem.
Note that reverting to a previous kernel (for example kernel 6.6.x LTS) as previously suggested is another likely resolution. See Manjaro Kernels in the Wiki for information on how to do that.
I hope this is helpful. Cheers.
And that foreign partition has an NTFS volume, right?
There is a condition resulting from the recent kernel 6.8 update that does prevent mounting of NTFS volumes for some users. See the note in the Stable 2024-04-04 Update announcement to see if this also relates to you.