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Sigil is a line based editor that uses syntax highlighting. So yes, it would break any line based editor that uses syntax highlighting and this would happen in all versions of Sigil.
You have no lines to syntax highlight, just one huge one!
Mend on Open may help as it introduces line breaks after block tags but I am not sure if a br is a block tag or not. That said doing a Mend and Prettify on first opening is probably the best way to handle that or immediately use a Find and Replace after to add in true line breaks after each br tag.
Then all editing should be back to normal.
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