Scheduled Transactions Not Working on MonotonicEmulator

[jribbink]

🐞 Bug Report

Scheduled transactions fail when using MonotonicEmulator chain (e.g., with SimpleAddresses=true), causing the error:

"Could not find Execute Scheduled Transactions Capability in storage"

This primarily affects the Cadence test framework (see onflow/flow-cli#2181).

Root Cause

The FVM bootstrap only issues the scheduled transaction executor capability for transient chains:

flow-go/fvm/bootstrap.go

Lines 837 to 849 in 8b69d4c

	// TODO: JanezP this could be controlled by a flag instead of a hidden check here
	if b.ctx.Chain.ChainID().Transient() {
	sc := systemcontracts.SystemContractsForChain(b.ctx.Chain.ChainID())
	txBody, err = blueprints.IssueScheduledTransactionExecutorTransaction(b.ctx.Chain, sc.ScheduledTransactionExecutor.Address)
	if err != nil {
	panic(fmt.Sprintf("failed to create scheduled transaction executor transaction: %s", err))
	}
	txError, err = b.invokeMetaTransaction(
	b.ctx,
	Transaction(txBody, 0),
	)
	panicOnMetaInvokeErrf("failed to create scheduled transaction executor: %s", txError, err)
	}

MonotonicEmulator is not in the Transient() list, even though it's only used for testing/emulator purposes like Emulator.

Solution

Add MonotonicEmulator to the Transient() function alongside Emulator.

Context

onflow/flow-cli#2181