Could you please paste the exact YAMLs you used (you can concatenate them into a a single file and upload). Please also indicate which version of Timeloop you used.

I used timeloop-model in Timeloop.v4 with TimeloopFE, as guided by the tutorial.
The input YAML file (parsed by TimeloopFE) is attached below.
The only change from exercise 2 no-tiling is the permutation attribute of MainMemory (PRK -> RKP).

You can observe the MainMemory->STATS->Inputs->Scalar reads = 48 (P $$\times$$ R).
However, I expected this to be P + R - 1 because:

   P    delta_size  num_epochs_
 -----  ----------  -----------
   0         R           1
  1-15       1          P-1

The same behavior is observed when I change the permutation in 'exercise 2 tiled mapping'.

Attachment: Input YAML file parsed by timeloopFE

Thank you for bringing this to our attention, and thank you for the detailed reproduction instructions.

I successfully reproduced the issue. It was a pretty serious and longstanding bug, although fortunately the fix was just a few localized lines of code. I have pushed the fix to the branch translation_fix.

Could you please test it on your end and let me know if it's working?

I have tested all the mappings introduced in the ISCA '20 tutorial, exercise 2. Thanks to your excellent work, no further issues were observed.
ISLOS_tiled.txt
ISLOS_untiled.txt