Troubleshooting

Ok, I checked an ON428 downloaded from CRA this morning (see attached).
https://www.canada.ca/en/revenue-agency/services/forms-publications/tax-packages-years/general-incom...

So, while this part of my original post quoted below is incorrect - (they have switched the "plus" and "minus" orders and logic in 2023:

So I believe line 52 is actually the Ontario TOSI, and line 54 is actually the Ontario Non-refundable tax credit from line 50 and should be labelled as such.
And line 55 should say "Line 53minus line 54".

I believe this part of my post below is still correct, and TurboTax Online is injecting the incorrect values into Lines 52 (TOSI), and Line 54, in the downloaded T1 when no TOSI is claimed:

Line 50 has a value, but it's not being injected into the indicated line 52.
Line 54 is getting that value instead and vice versa.

To Summarize: In TurboTax Online's downloaded T1: It appears the contents of Line 54 should be where Line 52 is, and the contents of Line 52 should be where Line 54 is.