Several commands and other data types have undefined references in tagpdf-code, displaying "This function is documented on page ??". Here's the list of such instances.
Messages
struct-unkown
struct-orphan
tree-struct-still-open
show-struct and show-kids
role-parent-child
role-remapping
Commands
\tag_socket_use:n, \tag_socket_use:nn, and \UseTaggingSocket
Several commands and other data types have undefined references in tagpdf-code, displaying "This function is documented on page ??". Here's the list of such instances.
Messages
struct-unkown
struct-orphan
tree-struct-still-open
show-struct
andshow-kids
role-parent-child
role-remapping
Commands
\tag_socket_use:n
,\tag_socket_use:nn
, and\UseTaggingSocket
\tag_struct_use_num:n
\tag_struct_gput:nnn
Other
debug/structures (show-key)
Possibly related: https://github.com/latex3/latex3/issues/1345