I switched to the kernel 6.18.26 and zramctl does not show the correct information. Regardless of whether swap in zram is used, zramctl always displays the same values:
zramctl
NAME ALGORITHM DISKSIZE DATA COMPR TOTAL STREAMS MOUNTPOINT
/dev/zram0 lz4 3G 4K 64B 20K 2 [SWAP]
However, in the older kernel 6.12.85 everything is correct and when swap in zram is already used, you can see the correct values, e.g. :
zramctl
NAME ALGORITHM DISKSIZE DATA COMPR TOTAL STREAMS MOUNTPOINT
/dev/zram0 lz4 3G 82,9M 36,8M 38,7M 2 [SWAP]
Is this a 6.18.xx kernel issue or an issue of some other package in Manjaro?