[PROBLEM] Update library

[alexarz]

I currently have a "clean" library of 1310 albums and 17313 tracks on a 2Tb USB 3.0 HDD, and 13 albums on the SDCARD where Moode is installed.
I generated the library, the libcache_all.json file is about 9 Mb in size. There are no errors in the mpd logs. There is only an error in the java console -

Code:

playerlib.js:706
Uncaught ReferenceError: loadLibrary is not defined
at Object.success (playerlib.js:706:40)
at u (jquery-1.8.2.js:974:30)
at Object.fireWith [as resolveWith] (jquery-1.8.2.js:1082:7)
at N (jquery-1.8.2.js:7788:14)
at XMLHttpRequest.n (jquery-1.8.2.js:8500:8)

Then I add one album to the SDCARD and run "Update this folder", I see a message about the update and the spinner spins for a few seconds. After the spinner disappears, I see the LED on the HDD start blinking. In this case, the libcache_all.json file is reset and the variables take the values -

Code:

GLOBAL.libLoading;
true
GLOBAL.libRendered;
false

Accordingly, at this time I can no longer update the folder, I get a message that "Library update is already in progress."
This continues for 18-20 minutes.
After that, when the LED stops blinking, everything returns to normal, data appears in the libcache_all.json file, and I can update a separate folder again.
I tried several times, and the result is 100% the same
Apparently, the entire library is rebuilt, although only one album was added.
I don't know why this only occurs for individual users, maybe it is related to the location of the library or something else, but I want to figure it out.
It's just that under these same conditions on version 8.3.3, updating a separate folder is very fast, and does not entail rebuilding the entire library.
It's just not my entire library, and I think that when I hook it all up, the update time will increase even more.