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Fix validators.disabled() to save/restore state on nesting

Fix validators.disabled() to save/restore state on nesting: a task in repo2rlenv-pr-diff (Harbor dataset). Title: Fix validators.disabled() to save/restore state on nesting

The task

**Title:** Fix validators.disabled() to save/restore state on nesting

Part of FineEnvs/repo2rlenv-pr-diff.