The similar issue which is solved before is an upstream issue:
Could this be also an upstream issue?
FYI:
Observation 1: after the fix of the aforesaid upstream issue, the input of plain text, i.e. a new line of text beginning with no special decoration(“- “, etc) and containing no style decoration(”==”, “**”, “_”, etc), becomes normal in Obsidian. But any text with any style related controls/decorations mentioned above remains confronting a similar issue.
Proposal 1: I suspect that for these cases, a similar upstream issue is still there.
Observation 2: However, as this issue only appears within Obsidian now and this issue is not able to be reproduced on the CM6 website, I don’t know what kind of information can be provide to the author of CM6 to identify or even to prove that it is an issue of CM6.
Proposal 2: Could you help providing some information which may help to identify or locate the owner of this issue？