What's the meaning of the highlighted left side dot?
I found it in the tango Almagro by Vicente San Lorenzo (lyrics by A. Timarni). It looks too clean to be noise in the score capture.
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It's a printing error in the original.
Similar dots appear
and the dot is missing from this treble-staff fermata
There is a different copy of the score in a YouTube video, and it does not have any of those defects.
In particular, here's a screenshot of the measure where the left-side dot would otherwise appear.
Just another copy of the score. It confirms that those dots are just "flyspecks" or something. (There's another tango called "Almagro" by Cipolla; they seem to have run out of names.) https://www.todotango.com/english/music/song/627/Almagro/