[Bug]: Linking fails for iOS device builds with version 20.2.45

[Qonstrukt]

Describe the bug 🐞

While creating a local build for my iOS device, I'm met with the following error:

1>Microsoft.NET.ILLink.targets(96,5): Error NETSDK1144 : Optimizing assemblies for size failed.

Step to reproduce

1. Have a project with net9.0-ios as TargetFramework
2. Upgrade ReactiveUI from 20.1.63 to 20.2.45
3. Start a device build (even with MtouchLink set to None)

Reproduction repository

https://github.com/reactiveui/ReactiveUI

Expected behavior

The build should succeed. This is a very clear difference between the previous and current version. I tried with clean build directories, and can reproduce it every time.

I unfortunately don't have a reproduction repository yet.

Screenshots 🖼️

No response

IDE

Rider macOS

Operating system

MacOS

Version

15.3.2

Device

iPhone 15 Pro

ReactiveUI Version

20.2.45

Additional information ℹ️

Simulator builds are unaffected.

This is the full error:

1>ILLink: Error IL1012 : IL Trimmer has encountered an unexpected error. Please report the issue at https://aka.ms/report-illink
Fatal error in IL Linker
Unhandled exception. System.IndexOutOfRangeException: Index was outside the bounds of the array.
   at System.Collections.Immutable.ImmutableArray`1.get_Item(Int32 index)
   at Mono.Linker.Dataflow.TrimAnalysisMethodCallPattern.Merge(ValueSetLattice`1 lattice, TrimAnalysisMethodCallPattern other)
   at Mono.Linker.Dataflow.MethodBodyScanner.HandleCall(MethodBody callingMethodBody, Instruction operation, Stack`1 currentStack, Dictionary`2 locals, InterproceduralState& interproceduralState, Int32 curBasicBlock)
   at Mono.Linker.Dataflow.MethodBodyScanner.Scan(MethodIL methodIL, InterproceduralState& interproceduralState)
   at Mono.Linker.Dataflow.ReflectionMethodBodyScanner.Scan(MethodIL methodIL, InterproceduralState& interproceduralState)
   at Mono.Linker.Dataflow.MethodBodyScanner.InterproceduralScan(MethodIL startingMethodIL)
   at Mono.Linker.Dataflow.ReflectionMethodBodyScanner.InterproceduralScan(MethodIL methodIL)
   at Mono.Linker.Steps.MarkStep.MarkReflectionLikeDependencies(MethodIL methodIL, Boolean requiresReflectionMethodBodyScanner, MessageOrigin origin)
   at Mono.Linker.Steps.MarkStep.ProcessMethod(MethodDefinition method, DependencyInfo& reason)
   at Mono.Linker.Steps.MarkStep.ProcessQueue()
   at Mono.Linker.Steps.MarkStep.ProcessPrimaryQueue()
   at Mono.Linker.Steps.MarkStep.Process()
   at Mono.Linker.Steps.MarkStep.Process(LinkContext context)
   at Mono.Linker.Pipeline.ProcessStep(LinkContext context, IStep step)
   at Mono.Linker.Pipeline.Process(LinkContext context)
   at Mono.Linker.Driver.Run(ILogger customLogger)
   at Mono.Linker.Driver.Main(String[] args)
Build continuing because "ContinueOnError" on the task "ILLink" is set to "ErrorAndContinue".
Target ILLink:
1>Microsoft.NET.ILLink.targets(96,5): Error NETSDK1144 : Optimizing assemblies for size failed.

[howitzergamesllc]

I am seeing the same. It seems to only effect macOS release builds and iOS debug/release builds. Current workaround was to downgrade to ReactiveUI version 20.1.63.

[DevEddy]

Same here, can confirm the workaround.