Steps to replicate the issue (include links if applicable):
open a module source and add this text:
--[=[
this is a long comment that doesn't highlight correctly
]=]

What happens?:
first line is highlighted as a comment; the rest is not; but,
--[=[this is a long comment is highlighted correctly]=]

What should have happened instead?:
all of the text between and including --[=[ and ]=] should be highlights as a comment

Other information (browser name/version, screenshots, etc.):
windows 11 chrome current