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.
{
        return m_allocated_chunks.size();
    }
    /**
     * Size in bytes to allocate per chunk, currently hardcoded to a fixed size.
     */
    [[nodiscard]] size_t ChunkSizeBytes() const
    {
        return m_chunk_size_bytes;
    }
};
/**
 * Forwards all allocations/deallocations to the PoolResource.
 */
template <class T, std::size_t MAX_BLOCK_SIZE_BYTES, std::size_t ALIGN_BYTES>
class PoolAllocator
{
    BYTES>* m_resource;
    template <typename U, std::size_t M, std::size_t A>
    friend class PoolAllocator;
public:
    using value_type = T;
    using ResourceType = BYTES>;
    /**
     * Not explicit so we can easily construct it with the correct resource
     */
    PoolAllocator(ResourceType* resource) noexcept