Assigning an Objective-C block without bridging through a Swift closure crashes on invocation

SomeObject.h

#import <Foundation/Foundation.h>

typedef void (^SomeBlock)(NSString * _Nonnull someParameter);

_Nonnull SomeBlock defaultBlock();


@interface SomeObject : NSObject

@property (nonatomic, copy, nullable) SomeBlock someBlock;

- (void)someAction;

@end

SomeObject.m

#import "SomethingObjectiveC.h"

SomeBlock defaultBlock() {
    return ^(NSString *someParameter) {
        NSLog(@"%@", someParameter);
    };
}

@implementation SomeObject

- (void)someAction {
    if (self.someBlock) {
        self.someBlock(@"Hello World!");
    }
}

@end

Swift.swift

let something = SomeObject()

// Works as expected
something.someBlock = { print($0) }
something.someAction()

// Crashes 💥
something.someBlock = defaultBlock()
something.someAction()

// Works as expected
something.someBlock = Optional(defaultBlock())
something.someAction()

// Works as expected
something.someBlock = unsafeBitCast(defaultBlock(), to: SomeBlock.self)
something.someAction()