Looking to see if anyone has this same issue. I'd guess it is most likely a mod causing the problem. If you have seen it and know the culprit please let me know.
As seen below the ID for Dry Grass needed for the Pit Kiln has been internally replaced by the ID for shoes. For kicks I did try to place shoes to see if the game crashed or some odd interaction would happen. It did not, the clay form was swapped with the shoes as it should be. I have also included my mod list.
MOD LIST:
alchemy_1.7.14.zip
allclasses2.0.3.zip
apebeams-1.21.0-v1.1.0.zip
apegrapes-v1.21.0-1.3.0.zip
apelanterns-v1.21.0-1.3.3.zip
armory_1.2.0.zip
arrowbarrels-V1.21.0-1.2.1.zip
AttributeRenderingLibrary-v2.1.1.zip
Auto Map Markers 4.0.3 - Vintagestory 1.21-rc.zip
BetterRuinsv0.5.0.zip
biomes_1.21.0.zip
bola_1.2.3.zip
butchering_1.10.0.zip
butterflycases_1.0.2.zip
castaway.zip
coinage-1.16.1.zip
combatoverhaul_0.9.1.zip
configlib_1.10.1.zip
containersbundle_1.1.2.zip
debarkedlogstofirewood-v1.0.2.zip
DriedPeatv1.1.1.zip
envelopes_2.0.2.zip
farseer_1.3.2.zip
FemaleSeraph_0.4.1.zip
firewoodtostick.zip
FloralZonesCosmopolitanRegion-v1.0.5.zip
FromGoldenCombs-1.21-v1.9.1.zip
goblinears2.3.1.zip
hangingoillamps_1.0.5.zip
hydrateordiedrate_2.2.9.zip
JacksDryableFirewood_1.1.0.zip
maltiezcrossbows_1.5.1.zip
maltiezfirearms_1.2.0.zip
medievalexpansionpatch-1.3.0.zip
More fuel v1.0.9.zip
morearrows_1.1.1.zip
nbcartographer_2.2.1.zip
NotEnoughMapIcons-v1.1.0.zip
NoticeBoard_1.1.2.zip
overhaullib_1.5.3.zip
PlayerList-2.1.5.zip
playermodellib_1.0.5.zip
primitivesurvival_3.9.5.zip
purposefulstorage_1.4.1.zip
quarterlogstofirewood-v1.0.1.zip
quiversandsheaths_0.3.3.zip
RecyclingTools-v1.4.3.zip
rivers_4.7.2.zip
rustboundmagic_3.0.6.zip
SaltAndSands-1.1.3.zip
shelfobsessed_v1.6.2.zip
simpleMapMarkers_1.0.0.zip
sortablestorage_2.4.2.zip
statushudcont_3.3.1.zip
stepupcontinued_0.0.1.zip
stonebakeoven_1.2.0.zip
tabards_0.2.1.zip
TabletopGames-v3.0.0.zip
thatchexpanded_1.2.1.zip
translocatorengineeringredux_1.6.0.zip
Unconscious_1.12.8.zip
undergroundmines_1.0.5.zip
UsefulShears-V.1.0.0.zip
Vanity-2.4.3.zip
viescraftmachines_2.4.1.zip
vinconomy_5.0.0.zip
vsimgui_1.1.12.zip
wildfarmingrevival_1.4.0.zip
windchimes-V1.21.0-1.3.2.zip
youvegotmail_1.0.14.zip