It is not that it is invisible... it is not there.
If a setting was marked to delete all empty snippets after import (or something like that; there's a Quick Edit menu command that does so, for example), then they were deleted, not hidden.
You would need to add it again. Ctrl+T adds a new generic text snippet. If you want it to be recognized as a specific snippet from the Topic Definition, you need to use the menu to add it from the "Types for this Section" list.
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