Sentinel connection error when using the highIntegrity = true configuration

I am using Redis with the sentinel model.
Environment information:

Redis version: 7.0.5
StackExchange.Redis version: 2.8.58
My connection string configuration is as follows:
“10.0.0.1:26379,10.0.0.2:26379,10.0.0.3:26379,serviceName=mycluster,abortConnect=false,highIntegrity=true”

I encountered the following error:

StackExchange.Redis.RedisConnectionException: Sentinel: The ConnectionMultiplexer is not a Sentinel connection. Detected as: Standalone
   at StackExchange.Redis.ConnectionMultiplexer.GetSentinelMasterConnection(ConfigurationOptions config, TextWriter log) in /_/src/StackExchange.Redis/ConnectionMultiplexer.Sentinel.cs:line 173
   at StackExchange.Redis.ConnectionMultiplexer.SentinelPrimaryConnectAsync(ConfigurationOptions configuration, TextWriter writer) in /_/src/StackExchange.Redis/ConnectionMultiplexer.Sentinel.cs:line 157
   at Microsoft.Extensions.Caching.StackExchangeRedis.RedisCache.ConnectSlowAsync(CancellationToken token)
   at Microsoft.Extensions.Caching.StackExchangeRedis.RedisCache.GetAndRefreshAsync(String key, Boolean getData, CancellationToken token)
   at Microsoft.Extensions.Caching.StackExchangeRedis.RedisCache.GetAsync(String key, CancellationToken token)
   at Microsoft.Extensions.Caching.Distributed.DistributedCacheExtensions.GetStringAsync(IDistributedCache cache, String key, CancellationToken token)

Before setting highIntegrity=true, I did not encounter this error.

Please help me find the root cause of the error.
Thank you!

Start in src/StackExchange.Redis/ConnectionMultiplexer.Sentinel.cs at GetSentinelMasterConnection and SentinelPrimaryConnectAsync, then trace how the highIntegrity option is parsed and how the connection is detected as Standalone. Reproduce the reported configuration with Redis 7.0.5 and StackExchange.Redis 2.8.58. Done means the root cause of the Sentinel detection error is identified and documented.