Possible null reference return.

Nullable value type may be null.

Ensure that 'BackupManager.Dispose' is declared as protected, virtual, and unsealed (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1063)

Ensure that 'PluginImplementation.Dispose' is declared as protected, virtual, and unsealed (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1063)

Type 'Plugin' owns disposable field(s) '_service' but is not disposable (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1001)

Prefer a 'TryGetValue' call over a Dictionary indexer access guarded by a 'ContainsKey' check to avoid double lookup (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1854)

Prefer a 'TryGetValue' call over a Dictionary indexer access guarded by a 'ContainsKey' check to avoid double lookup (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1854)

Prefer a 'TryGetValue' call over a Dictionary indexer access guarded by a 'ContainsKey' check to avoid double lookup (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1854)

Possible null reference return.