When customer set "mac-validate strict" in dynamic-profile as below, adding member links of ae bundle will cause traffic loss.

#set dynamic-profiles demux-profile interfaces demux0 unit "$junos-interface-unit" family inet mac-validate strict

This issue is described in PR1788669.

https://prsearch.juniper.net/problemreport/PR1788669

It is regression bug and introduced PR is PR 1647214.

Introduced-In-Releases:

21.2R3-S2 20.3R3-S5 22.3R1-EVO 20.2R3-S5 22.2R2-EVO 21.4R3 22.2R2 21.3R3 22.2R1 19.4R3-S9 22.1R2 21.2R3-S1 21.4R3-EVO 20.4R3-S4 22.1R2-EVO 22.3R1

Resolved-In

evo:24.2R2-EVO evo:24.3R1-EVO evo:24.4R1-EVO junos:24.2R2 junos:24.3R1

Workaround is changing "mac-validate strict" to "mac-validate loose".