Umbrella issue for 26.0 testing. Please help testing on a wide variety of supported platforms, as well as interaction with different software.

Let us know which version you tested on which operating system.

If you find an issue, please search Github for known issues first and then open a new Github issue.

*This meta issue should not be used to report bugs, as a single thread makes it impossible to track more than one topic.*

See [26.0 Draft Release Notes](https://github.com/bitcoin-core/bitcoin-devwiki/wiki/26.0-Release-Notes-Draft) for a list of changes.

See here for the testing guide: https://github.com/bitcoin-core/bitcoin-devwiki/wiki/26.0-Release-Candidate-Testing-Guide.
explicit CCoinsCacheEntry(Coin&& coin_) : coin(std::move(coin_)), flags(0) {}
    CCoinsCacheEntry(Coin&& coin_, unsigned char flag) : coin(std::move(coin_)), flags(flag) {}
};
/**
 * PoolAllocator's MAX_BLOCK_SIZE_BYTES parameter here uses sizeof the data, and adds the size
 * of 4 pointers. We do not know the exact node size used in the std::unordered_node implementation
 * because it is implementation defined. Most implementations have an overhead of 1 or 2 pointers,
 * so nodes can be connected in a linked list, and in some cases the hash value is stored as well.
 * Using an additional sizeof(void*)*4 for MAX_BLOCK_SIZE_BYTES should thus be sufficient so that
 * all implementations can allocate the nodes from the PoolAllocator.
 */
using CCoinsMap = std::unordered_map<COutPoint,
                                     CCoinsCacheEntry,
                                     SaltedOutpointHasher,
                                     std::equal_to<COutPoint>,
                                     PoolAllocator<std::pair<const COutPoint, CCoinsCacheEntry>,
                                                   sizeof(std::pair<const COutPoint, CCoinsCacheEntry>) + sizeof(void*) * 4,
                                                   alignof(void*)>>;
using CCoinsMapMemoryResource = CCoinsMap::allocator_type::ResourceType;
class CCoinsViewCursor