How about call GC.SuppressFinalize(this) to prevent add to finalization queue.

[doublnt]

   /// <summary>
        /// Returns the internal buffers to the ArrayPool.
        /// </summary>
        public void Dispose()
        {
            ReturnArray();
            _size = 0;
            _version++;
        }

https://github.com/jtmueller/Collections.Pooled/blob/86cb27aa7ef64f52f169d0e2f7d512493ddc1b51/Collections.Pooled/PooledList.cs?2#L1568