Random issue: H.264 publish/subscription may be failed for Firefox 70

[wayunge]

environment:
mcu :20191009 ubuntu43
browser: safari13.0.2 and firefox70
step:
1、user join room,and publish a simulcast stream with these option:
option = {
audio:true,
video:h264,
{rid:"f",active:true,scaleResolution:4.0},
{rid:"q",active:true,scaleResolution:2.0},
{rid:"h",active:true,scaleResolution:1.0}
}
results:
2、sub a forward stream with rid f or q only , can't sub and report errors
3、sub a forward stream with resolution(any value) only,can't sub and report errors
4、sub a forward stream with resolution(any value) and framerate 30,can't sub and report errors
expect:
sub a forward stream with rid only、 with resolution only、stream with resolution and framerate should be work well
console log: