Okay no you are not clearing it out but I think that maybe you are just being a bit impatient ?
If you look at this log extract, at 16.56.07 it is writing to a file, but by 16:56:38 SongKong had been restarted, this is only 31 seconds later, so how did this come about did SongKong actually crash and fail or did you stop/kill it off and then restart it.
23/03/2022 16.56.07:CET:Mp4TagWriter:writeHaveExistingMetadata:SEVERE: Writing:Option 7.1, Increased Data
23/03/2022 16.56.07:CET:JthinkSearchServer:doQuery:SEVERE: G54:D:\music_test\m4a\Back To Earth\Kairos - The spirit of time (m4a):false:false:false:false:?type=release&query= ( (artist:(back~0.7 OR to OR earth~0.7) ) AND (release:(kairos~0.7 OR the OR spirit~0.7 OR of OR time~0.7) release:(kairos~0.7 OR spirit~0.7 OR of OR time~0.7) )) AND tracks:10 AND src:1&limit=3&offset=0
23/03/2022 16.56.07:CET:JthinkSearchServer:doQuery:SEVERE: G54:D:\music_test\m4a\Back To Earth\Kairos - The spirit of time (m4a):false:false:false:false:URLEncoded:?type=release&query=+%28+%28artist%3A%28back%7E0.7+OR+to+OR+earth%7E0.7%29+%29+AND++%28release%3A%28kairos%7E0.7+OR+the+OR+spirit%7E0.7+OR+of+OR+time%7E0.7%29+release%3A%28kairos%7E0.7+OR+spirit%7E0.7+OR+of+OR+time%7E0.7%29+%29%29+AND+tracks%3A10+AND+src%3A1&limit=3&offset=0
23/03/2022 16.56.07:CET:Mp4TagWriter:writeHaveExistingMetadata:SEVERE: Writing:Option 7.1, Increased Data
23/03/2022 16.56.07:CET:Mp4TagWriter:writeHaveExistingMetadata:SEVERE: Writing:Option 7.1, Increased Data
23/03/2022 16.56.07:CET:Mp4TagWriter:writeHaveExistingMetadata:SEVERE: Writing:Option 7.1, Increased Data
23/03/2022 16.56.07:CET:Mp4TagWriter:writeHaveExistingMetadata:SEVERE: Writing:Option 7.1, Increased Data
23/03/2022 16.56.07:CET:Mp4TagWriter:writeHaveExistingMetadata:SEVERE: Writing:Option 7.1, Increased Data
23/03/2022 16.56.38:CET:SpecialPlatform:isMacMusicAppSupported:SEVERE: MacOS:windows 10
23/03/2022 16.56.38:CET:SpecialPlatform:isMacMusicAppSupported:SEVERE: MacOS:windows 10
23/03/2022 16.56.38:CET:SongKong:init:SEVERE: Checking for Existing Preferences:C:\Users\*******\AppData\Roaming\SongKong\songkong.properties:true
23/03/2022 16.56.38:CET:SongKong:setLocale:SEVERE: Locale is:en
23/03/2022 16.56.38:CET:SongKong:setExeFolder:WARNING: User Dir:C:\Program Files\Jthink\SongKong
23/03/2022 16.56.38:CET:SongKong:setExeFolder:WARNING: Java Dir:C:\Program Files\Jthink\SongKong\runtime
23/03/2022 16.56.38:CET:SongKong:init:WARNING: end
23/03/2022 16.56.38:CET:SongKong:finish:WARNING: finish
23/03/2022 16.56.39:CET:SongKong:writeSystemInfo:WARNING: SongKong 8.1 Scar 1134 07/01/2022 using Java 14.0.2 14.0.2+12 64bit on Windows 10 10.0 amd64 initialized successfully