Why do invalid signatures in OP_CHECKSIGADD not push to the stack?

I've been working through the static test vectors provided by bitcoin core to implement an interpreter.

Some surprising behavior I found was that in the case of OP_CHECKSIGADD, if an invalid signature is found, the interpreter fails execution rather than continuing. Why is this the case?

In my (likely naive) mental model, it seems that an incorrect signature should not increment the counter on the stack and continue execution.

https://github.com/bitcoin/bitcoin/blob/c92eb6cda0f402b83263c9a9ee129d5d0763fd3f/src/script/interpreter.cpp#L1096

This is the test case that triggers the behavior i'm talking about

 { "tx": "020000000342dbdd00df8ddb7968f88bd7c899d66c3007e19d1c71ddba2274f9e900c0cefa82010000006edc7db5db38e3ab6ba99b0b810400a211882152d27173c6a7945a40fe23b7924bff77cf6c0000000092d3c19742dbdd00df8ddb7968f88bd7c899d66c3007e19d1c71ddba2274f9e900c0cefa6101000000a1ea36c301b2d549000000000017a9142177f6af7e86b98028c5e4dd4a82d80f1c6492c7876f818b44", "prevouts": ["69cd3300000000001976a91410fa7d1c37dc119ceef9b79ec2d4abe7445c468188ac", "1d6a7600000000002251203b1c3f3adebc2e153ec7d8063cf0f2bb534171c554c0e969269a2f02dddd03f4", "1f49370000000000225120281511f00d3c3de3d36983e73a04295adb745511db699ce19d0d5331754dadf8"], "index": 2, "flags": "P2SH,DERSIG,CHECKLOCKTIMEVERIFY,CHECKSEQUENCEVERIFY,WITNESS,NULLDUMMY,TAPROOT", "comment": "siglen/invalid_csa_neg", "final": true, //omit success as it isn't necessary "failure": { "scriptSig": "", "witness": [ "ad71936bf8c2bfa761dd70af336e9f3f01f1dc7208f473d548ee025caad1f7fcf020bacfcfbad5b8be77f70655b59824a27fa025b1cefda56a5ca4c5592fafe6", "5220add82ad8000e562efe2b4f7447016e9f9fd3eb73e56e6b0f099c85aedcf34a7cba5287", "c106c3f692377db31176526c691d50a518c745f9aac8c0da21802f7a7652bd9a9d60808dd6363137648795cfbd150458b8cdf5ab35fe9dfd73ca2c2f21059349becc7442164c6ea9ce87a72f0d7197d1c06ae67d7b0f2a864ef793135a35fddbd9" ] } }

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