SPIFFS problem with Json

[kwis2]

I have analysed program from #1971 and in my opinion it is SPIFFS, not Json problem with about 430 bytes written.
with response I got

30 -> 30
31 -> 31
32 -> (null)
1388090 bytes written 427
1388895 file size 427
1389470 string size 427
1390865 JSON deserial err: Ok
abcdefghijklmnopqrtsuvwxyz
abcdefghijklmnopqrtsuvwxyz
abcdefghijklmnopqrtsuvwxyz
0 -> 0
1 -> 1
2 -> 2
3 -> (null)
4 -> (null)
.......
30 -> (null)
31 -> (null)
32 -> (null)
33 -> (null)
1454869 bytes written 430
1455674 file size 430
1456248 string size 430
1457647 JSON deserial err: Ok
abcdefghijklmnopqrtsuvwxyz
abcdefghijklmnopqrtsuvwxyz
abcdefghijklmnopqrtsuvwxyz
0 -> (null)
1 -> (null)

and after this it is not possible to write to SPIFFS

[kmihaylov]

@kwis2 did you still have issues with the latest build? May you get rid of JSON to confirm that the problem concerns SPIFFS?