Theme Files are removed from Source Folder when (re)exporting using Fast Save

[nickjohnsonpond]

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Windows 11 Pro 10.0.22631 Build 22631 MS Access for MS 365 V 2406 Build 16.0.17726.20078 64 bit vcs-addin 4.0.34

I've been experiencing glitchy behaviour with my database colours and fonts changing after a build and so have been using the tried and true 'push all the buttons to see if anything fixes the problem' technique.

I can consistently replicate the issue when I have Options:

Use Fast Save - True
Extract Theme Files - True
Sanitize Colors - None (Off)

Using the Export Source Files button from the Ribbon First time running the Export it takes about 4-5 seconds, I note that the displayed log form states Exporting Themes [1]

Second export takes about 0.48 seconds and the displayed log suggests that nothing has changed, however the entire \themes folder and contents is removed from the source folder.

Interestingly the Export.log file for the Fastsave states

No modified themes found in this database.

and the operations table doesn't seem to indicate any deletions (except possibly the "Clear Orphaned Files" row.)

--------------------------------------------------
Operations                    Count     Seconds
--------------------------------------------------
Clear Orphaned Files          15        0.11
Convert to JSON               853       0.10
Scan DB Objects               1         0.08
Increment Progress            205       0.04
Check for linked table        58        0.03
Console Updates               2         0.03
Parse JSON                    1         0.01
Get VBA Hash                  58        0.01
Parse JSON ISO Date           133       0.00
Compute SHA256                71        0.00
Quick Count Files             1         0.00
Quick Count Objects           1         0.00
Read File                     1         0.00
--------------------------------------------------
Other Operations                        0.02
--------------------------------------------------

If I turn on the option Show Detailed Output or turn off Use Fast Save this deletion doesn't occur.