Adds a note to the changelog about recovering after finalizing blocks…

… from a fork

CHANGELOG.md

@@ -13,19 +13,30 @@ from 16 weeks to 10 weeks so that it will panic before the expected activation h
 It also replaces the `shielded-scan` compilation feature with a new `zebra-scanner` binary, adds a `TrustedChainSync` module
 for replicating Zebra's best chain state, and a gRPC server in `zebra-rpc` as steps towards zcashd deprecation.
 
+Note: Zebra doesn't enforce an end-of-support height on Testnet, and previous versions of Zebra could mine or follow a chain fork that does not
+      activate NU6 on Testnet at height 2976000. Once a block from a fork is finalized in Zebra's state cache, updating to a version of Zebra that
+      does expect NU6 activation at that height will result in Zebra getting stuck, as it cannot rollback its finalized state. This can be resolved
+      by syncing Zebra from scratch, or by using the `copy-state` command to create a new state cache up to height 2975999. To use the `copy-state`
+      command, first make a copy Zebra's Testnet configuration with a different cache directory path, for example, if Zebra's configuration is at the
+      default path, by running `cp ~/.config/zebrad.toml ./zebrad-copy-target.toml`, then opening the new configuration file and editing the
+      `cache_dir` path in the `state` section. Once there's a copy of Zebra's configuration with the new state cache directory path, run:
+      `zebrad copy-state --target-config-path "./zebrad-copy-target.toml" --max-source-height "2975999"`, and then update the original 
+      Zebra configuration to use the new state cache directory.
+
 ### Added
 
 - A `zebra-scanner` binary replacing the `shielded-scan` compilation feature in `zebrad` ([#8608](https://github.com/ZcashFoundation/zebra/pull/8608))
 - Adds a `TrustedChainSync` module for keeping up with Zebra's non-finalized best chain from a separate process ([#8596](https://github.com/ZcashFoundation/zebra/pull/8596))
 - Add a tonic server in zebra-rpc with a `chain_tip_change()` method that notifies clients when Zebra's best chain tip changes ([#8674](https://github.com/ZcashFoundation/zebra/pull/8674))
-- NU6 network upgrade variant ([#8693](https://github.com/ZcashFoundation/zebra/pull/8693), [8733](https://github.com/ZcashFoundation/zebra/pull/8733))
+- NU6 network upgrade variant, minimum protocol version, and Testnet activation height ([#8693](https://github.com/ZcashFoundation/zebra/pull/8693), [8733](https://github.com/ZcashFoundation/zebra/pull/8733), [#8804](https://github.com/ZcashFoundation/zebra/pull/8804))
 - Configurable NU6 activation height on Regtest ([#8700](https://github.com/ZcashFoundation/zebra/pull/8700))
 - Configurable Testnet funding streams ([#8718](https://github.com/ZcashFoundation/zebra/pull/8718))
 - Post-NU6 funding streams, including a lockbox funding stream ([#8694](https://github.com/ZcashFoundation/zebra/pull/8694))
 
 ### Changed
 
 - Reduced the end-of-support halt time from 16 weeks to 10 weeks ([#8734](https://github.com/ZcashFoundation/zebra/pull/8734))
+- Bumps the current protocol version from 170100 to 170110 ([#8804](https://github.com/ZcashFoundation/zebra/pull/8804))
 
 ### Fixed