inconsistency in arch packaging

inconsistency-arch-packages.txt

OBS needs some library to work:

[11:38] [5077] [patola@risadinha patola]% obs
obs: error while loading shared libraries: libavcodec.so.61: cannot open shared object file: No such file or directory
[11:39] [5078] [patola@risadinha patola]% ls -la /usr/lib/libavcodec.so*
lrwxrwxrwx 1 root root       22 Apr 22 05:26 /usr/lib/libavcodec.so -> libavcodec.so.62.0.101
lrwxrwxrwx 1 root root       24 Mar  2 16:52 /usr/lib/libavcodec.so.58 -> libavcodec.so.58.134.100
-rwxr-xr-x 1 root root 15230640 Mar  2 16:52 /usr/lib/libavcodec.so.58.134.100
lrwxrwxrwx 1 root root       23 Mar 14 02:42 /usr/lib/libavcodec.so.59 -> libavcodec.so.59.37.100
-rwxr-xr-x 1 root root 15540600 Mar 14 02:42 /usr/lib/libavcodec.so.59.37.100
lrwxrwxrwx 1 root root       22 Apr 22 05:26 /usr/lib/libavcodec.so.62 -> libavcodec.so.62.0.101
-rwxr-xr-x 1 root root 16976360 Apr 22 05:26 /usr/lib/libavcodec.so.62.0.101

and then I use the usual command, paru -F (actually pacman -F behind the curtains) and pkgfile:
[11:39] [5079] [patola@risadinha patola]% paru -F /usr/lib/libavcodec.so.58
usr/lib/libavcodec.so.58 is owned by extra/ffmpeg4.4 4.4.5-3
[11:39] [5080] [patola@risadinha patola]% paru -F /usr/lib/libavcodec.so.59.37.100
[11:39] [5081] [patola@risadinha patola]% pkgfile /usr/lib/libavcodec.so.59.37.100
[11:40] [5082] [patola@risadinha patola]% pkgfile /usr/lib/libavcodec.so.59       
[11:40] [5083] [patola@risadinha patola]% paru -F /usr/lib/libavcodec.so.59       
[11:40] [5084] [patola@risadinha patola]%

Why can't it find the owner of /usr/lib/libavcodec.so.59 ? It's ffmpeg5.1:

[11:41] [5086] [patola@risadinha patola]% pacman -Ql ffmpeg5.1 | grep libavcodec.so.59
ffmpeg5.1 /usr/lib/libavcodec.so.59
ffmpeg5.1 /usr/lib/libavcodec.so.59.37.100

Updating the databases doesn't change the results:

[11:41] [5088] [patola@risadinha patola]% paru -Fy 
:: Synchronizing package databases...
 core-testing          828.2 KiB  1596 KiB/s 00:01 [##########################################] 100%
 core is up to date
 extra                  45.3 MiB  38.2 MiB/s 00:01 [##########################################] 100%
 extra-testing           4.8 MiB  26.1 MiB/s 00:00 [##########################################] 100%
 multilib-testing        7.8 KiB   106 KiB/s 00:00 [##########################################] 100%
 multilib              226.0 KiB  2.43 MiB/s 00:00 [##########################################] 100%
 chaotic-aur            43.1 MiB  52.6 MiB/s 00:01 [##########################################] 100%
[11:41] [5089] [patola@risadinha patola]% sudo pkgfile -u
:: Updating 7 repos...
  download complete: multilib-testing     [     3.8 KiB  19.3K/s  6 remaining]
  download complete: core-testing         [  1260.0   B  5.45K/s  5 remaining]
  download complete: multilib             [   228.0 KiB   499K/s  4 remaining]
  download complete: core                 [  1312.8 KiB  2.05M/s  3 remaining]
  download complete: chaotic-aur          [    43.1 MiB  46.3M/s  2 remaining]
  download complete: extra-testing        [     3.5 MiB  3.09M/s  1 remaining]
  download complete: extra                [    45.1 MiB  3.65M/s  0 remaining]
:: download complete in 12.37s            <    93.2 MiB  7.54M/s  7 files    >
:: waiting for 1 repo to finish repacking...

[11:42] [5090] [patola@risadinha patola]% pkgfile /usr/lib/libavcodec.so.59
[11:42] [5091] [patola@risadinha patola]% paru -F /usr/lib/libavcodec.so.59
[11:42] [5092] [patola@risadinha patola]%

That never happens with other package formats. rpm -qf always gives me the rpm package the file belongs to. Same thing with dpkg -S. Why does it happen that way with arch?