https://www.mail-archive.com/haproxy@formilux.org/msg45060.html

Notable change in 2.8.10 for 4.17 is:

Dynamic servers testing under heavy load have been performed during 3.0 development cycle. This revealed that crashes could occur due to the removal of a server currently in used. Removal conditions were thus adjusted to reject such operation. Also, some settings were not completely initialized for dynamic servers which cause a difference of behavior with static ones.