Puzzle: message "Invalid version: Max supported version 0.1.2" when opening 0.1.1 file in Val 0.7.52

This bug is reported by a French user using Win 10. All her .vlt files created in Val 0.7.51 and Puzzle 0.1.1, don't open anymore in Puzzle since update to Val 0.7.52 and display the message "Invalid version: Max supported version 0.1.2" (see .png message, see file TOTEBAG.vlt). I could reproduce the bug in Mint 21: tried to open the file with Puzzle, message was displayed and Puzzle did not go further. I changed the Puzzle version to 0.1.2 in a text editor, the file opened and seemed to behave correctly (see TOTEBAG-copy1.vlt). I cannot test further, I have kept no personal file still indicating 0.1.1 Puzzle version.