sqlite3 cannot yield

puts [package require sqlite3]

proc bla {data} {
    after 200 [list [info coroutine]]
    yield
}

sqlite3 db :memory:
db function bla bla
db eval {
    create table foo (
      data text
    );
    create temp trigger insert_foo after insert on foo
    begin
      select bla(new.data);
    end;
}

coroutine main try {
    db eval {insert into foo values('something')}
} on error {str opts} {
    puts stderr [dict get $opts -errorinfo]
} finally {
    exit
}

vwait forever

Produces:
3.13.0
cannot yield: C stack busy
    while executing
"yield"
    (procedure "bla" line 3)
    invoked from within
"bla something"
    invoked from within
"db eval {insert into foo values('something')}"
    ("try" body line 2)