toggling vavpp=deint during playback doesn't work on AMD

Important Information

mpv 0.31.0-83-ge666546910
self-compiled build
Arch vanilla kernel 5.4.14
mesa git-master eb7cd575da02f3ae60d05112ca86ce6c2cd27e3c
RX 570

Reproduction steps

In input.conf, set up d vf toggle vavpp=deint=auto. Open the interlaced sample file via mpv --hwdec=vaapi sample.mkv and press d to toggle vavpp deinterlacing.

Expected behavior

It should enable vavpp deinterlacing, like it does on Intel.

Actual behavior

On AMD, it fails with

[vavpp] vaRenderPicture() failed (invalid VASurfaceID)
[vavpp] failed to output frame
Disabling filter vavpp.00 because it has failed.

Note: Unlike before, there shouldn't be no driver crashes anymore with AMD GPU, Linux 5.4.14 and recent mesa git-master. At least I couldn't make it crash once. It likely still crashes with older versions though, especially mesa.

Workaround:
Reload the file when toggling vavpp, then it works for some reason:
d loadfile "${path}" ; vf toggle vavpp=deint=auto

Plan is to report it to mesa if it's really a driver bug.

Log file

output.txt

Sample files

https://0x0.st/irt-.mkv

Reproduce with input.conf, mpv --hwdec=vaapi, the linked interlaced sample, and the output.txt log; compare toggling during playback with the reload workaround. Trace the vavpp filter and VA-API path around the invalid VASurfaceID failure, and confirm that toggling enables deinterlacing without disabling the filter or requiring a reload.