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If a block was defined via "dynamic", there will be only one block value until the expansion is known. Since we can't detect dynamic blocks at this point, don't verify MinItems while there are unknown values in the config. The decoder spec can also only check for existence of a block, so limit the check to 0 or 1.
If there are unknowns, the block may have come from a dynamic declaration, and we can't validate MinItems. Once the blocks are expanded, we will get the full config for validation without any unknown values.
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mildwonkey
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Having multiple dynamic blocks for the same block, where only one of them will actually resolve to a real block, doesn't pass validation because Terraform sees both blocks and thinks MaxItems is violated. This changes things (similar to how hashicorp#22221 did for MinItems) so that the validation is relaxed until later on when the dynamic blocks are resolved.
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MinItems> 1 can't be validated directly from the configuration is using dynamic blocks.We need to skip the validation in a few places to let these through.
Fixes #22195