A near-miss of the [?] marker
This is an exact recognized unknown marker, so replacing only the marker is mechanically safe.
Convention: A lyric you can't make out is [?].
Example
[Verse]
I heard (?)In the workbench this reads: Use [?] for an incomprehensible lyric.
[Verse]
I heard [?]The fix
In the workbench this finding carries one control, labelled Replace with [?]. The fix is classified as safe, so pressing it applies the edit directly — one press, one undo step.
The convention and its limits
This check detects the pattern shown above. An accepted example passes this check; it is not a review of the whole transcription.
Source
The source cited by this check:
Unknown lyric marker (opens in a new tab) verified Use [?] for unknown lyrics