We have seen the failure several times since 2025-11-25 (linux ppc64le, x86_64 and MacOS aarch64, compact object headers enabled):

gc/shenandoah/TestAllocObjectArrays.java#no-tlab:
# Internal Error (shenandoahVerifier.cpp:1356), pid=49678, tid=49757
# Error: Remembered set violation at init-update-references; object not properly registered

Referenced from:
  interior location: 0x00000000ff900268
  inside Java heap
    not in collection set
  region: | 2034|R |O|BTE ff900000, ff969c98, ff980000|TAMS ff900000|UWM ff969c98|U 423K|T 0B|G 0B|P 0B|S 423K|L 0B|CP 0

Object:
  0x00000000ff900268 - nk 1548 klass 0x000002f100183000 [Ljdk.internal.vm.FillerElement;

        allocated after mark start
    not after update watermark
        marked strong
        marked weak
    not in collection set
    age: 0
    mark: mark(is_unlocked no_hash age=0)
    region: | 2034|R |O|BTE ff900000, ff969c98, ff980000|TAMS ff900000|UWM ff969c98|U 423K|T 0B|G 0B|P 0B|S 423K|L 0B|CP 0

  0x00000000ff900268: 00000001 00183000 00000018 00007fff 00000067 00000000 00000000 00000000 .....0..........g...............
  0x00000000ff900288: 00000000 00000000 00000000 00000000 00000000 00000000 c014e2a8 c001d360 ............................`...

Forwardee:
  (the object itself)

gc/shenandoah/TestHeapUncommit.java#generational:
# Internal Error (shenandoahVerifier.cpp:1356), pid=17703, tid=17816
# Error: Remembered set violation at init-update-references; object not properly registered

Referenced from:
  interior location: 0x00000000ffa83e80
  inside Java heap
    not in collection set
  region: | 2037|R |O|BTE ffa80000, ffae9bf8, ffb00000|TAMS ffa80000|UWM ffae9bf8|U 422K|T 0B|G 0B|P 0B|S 422K|L 0B|CP 0

Object:
  0x00000000ffa83e80 - nk 1551 klass 0x000001fe00183c00 [Ljava.lang.Object;

        allocated after mark start
    not after update watermark
        marked strong
        marked weak
    not in collection set
    age: 0
    mark: mark(is_unlocked no_hash age=0)
    region: | 2037|R |O|BTE ffa80000, ffae9bf8, ffb00000|TAMS ffa80000|UWM ffae9bf8|U 422K|T 0B|G 0B|P 0B|S 422K|L 0B|CP 0

  0x00000000ffa83e80: 00000001 00183c00 0000000c c0146d78 00000000 c014e258 00000000 00000000 .....<......xm......X...........
  0x00000000ffa83ea0: 00000000 00000000 00000000 c0143af0 c0143b30 00000000 00000000 00000000 .............:..0;..............

Forwardee:
  (the object itself)