Mandatory input issue

(At least) Since 2.6.4, the mandatory fields in conditional groups are not enforced anymore.

See below an extract of our code. Till recently the gewenst_subthema selection was mandatory and enforced. But recently that changed. So we are now getting answers without the mandatory fields.

Thanks in advance,

Jan

[group subthema_kleuterwandeling]
Gewenst subthema :verplicht

[select* gewenst_subthema
“”
“1) op de kinderboerderij – het boerderijleven”
“2) op de kinderboerderij – bijenwandeling: over bloemetjes en bijtjes (lente)”
“3) op de kinderboerderij – Lowiekes wandeling”
“4) Kabouters en elfjes”
“5) Wie helpt er Pluisje”
]