When the interconnect node which have both SRv6 and MPLS-SR deployed with microloop-avoidance and there is a link change in SRv6 network, some of the IPv6 routes may disappear for a certain time on this interconnect node.

Enable trace-option for Protocols ISIS with flag spring and post-convergence-lfa and it is logged that the IPv6 routes deleted due to next-hop interface has no family mpls configured and the route added back after MLA-delay timer expired:

Nov 29 16:36:15.515479     MPLS family not enabled on nexthop Intf xe-0/0/3.10
Nov 29 16:36:15.515492   Delete route fd01:192:168::/48, no next hop
......
Nov 29 16:36:25.505928  Handling MLA-delay timer expiry
Nov 29 16:36:26.521828   Add route fd01:192:168::/48

Configure family mpls on the nexthop interface, the IPv6 routes re-convergence time is normal without delay.  If microloop avoidance is configured for both SRv6 and SR-MPLS, IS-IS prefers to take the SR-MPLS path.