SD read broken on MKS Robin Nano 1.2 (and clones) after 14 Jan 2024

[mechano]

Did you test the latest bugfix-2.1.x code?

Yes, and the problem still exists.

Bug Description

I've compiled successfully the 14 Jan 2024 version and is fully working.
Now I'm still able to compile the last bugfix, but on Kingroon KP3S (Pro and S1), KP5L machines and other Robin Nano 1.2 machines the onboard microSD reader doesn't work anymore.
I can see file list, I choose one and the print doesn't start.
When I go back in the file list the filenames are 8.3 characters and no folders are read.

It prints from Octoprint.

Bug Timeline

New one

Expected behavior

Read files and print them.

Actual behavior

Read file but doesn't print. Going back to file list the directory structure is broken.

Steps to Reproduce

No response

Version of Marlin Firmware

2.1.2-bugfix after 14 Jan 2024

Printer model

Kingroon KP3S Pro and KP5L

Electronics

Stock Robin Nano 1.2 clone boards.

LCD/Controller

No response

Other add-ons

No response

Bed Leveling

ABL Bilinear mesh

Your Slicer

Other (explain below)

Host Software

SD Card (headless)

Don't forget to include

• A ZIP file containing your Configuration.h and Configuration_adv.h.

Additional information & file uploads

Configuration.zip

[Hero3dPrints]

Same problem here. Read fails under random conditions. Reverting to mks firmware has no issue.
Marlin.zip

[avizienis]

Same here with the current 2.1.x bugfix version. Haven't tried the stable ones