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We have run into this issue already twice and I'm afraid that without a proper fix we will run into this every update release. The previous issues are issue #244049 and issue #246615. The root of the problem is described by Tomas Zezula: It's because the stubs.zip timestamp does not changed and also it's not registered in the GPR on when indexer fires its version has changed. The stubs.zip are registered much later when first request on javascript indexer is done. We have to change the timestamps not only the zip files, but also timestamps of the files inside to get reindex them after the updates. The updates usually increase the number of the JS index, so the core files has to be reindexed. But because the runtime files are put to the GPR lazy, the infrastructure doesn't reindex the files.