warp sync doesn't work anymore on gtest (since forced finality)

Since we forced finality with root call grandpa.noterStalled, warp sync doesn't work.

I tried to setup warp sync WithTarget with a checkpoint after the forced finality but the gap sync still fail and then the node ban all peers:

2026-03-19 20:42:39 💔 Error importing block 0x4dfbbe52e555c74762275149d9fa0b83dc5e1106a6c04b9610115f8f4a7ff72c: consensus error: Import failed: Justification required when importing an old block with authority set change.    
2026-03-19 20:42:39 💔 Error importing block 0x4dfbbe52e555c74762275149d9fa0b83dc5e1106a6c04b9610115f8f4a7ff72c: consensus error: Import failed: Justification required when importing an old block with authority set change.    
2026-03-19 20:42:41 ⏩ Block history, #2120635 (0 peers), best: #2291744 (0x9c09…812b), finalized #2276811 (0x3dc5…f521), ⬇ 17.6kiB/s ⬆ 1.0kiB/s