Hi
with release 12.1X46-D35.1 this not happens
@srx-re1> ...ps | match fxp0 | display set
set groups node0 interfaces fxp0 disable
set groups node1 interfaces fxp0 disable
@srx-re1> show configuration apply-groups
apply-groups "${node}";
{primary:node1}
@srx-re1> show interfaces terse fxp0
Interface Admin Link Proto Local Remote
fxp0 down up
{primary:node1}
@srx-re1> show version
node1:
--------------------------------------------------------------------------
Model: srx210b
JUNOS Software Release [12.1X46-D35.1]