[Bug] Tests cannot be run with a central funding account as described in the README

[wulfraem]

Bug description

Tests cannot be run as described when funding new accounts with a central funding address as described in identity_iota_core README.

New accounts receive 0.5 IOTA, while an internal check aborts due to them not having enough funds (1 IOTA).

This only affects runs with a central funding account, regular test runs are not affected.

Language version

What programming language are you using? Rust or one of the bindings?
Which version of the language are you running?

• Language: Rust
• Version: rustc 1.91.1 (ed61e7d7e 2025-11-07)

IOTA Identity version

Which version of IOTA Identity are you using?

• Version (version number, commit, or branch): current main branch (1.8.0-beta.3), rev c6e2f2a

Steps To reproduce the bug

Explain how the maintainer can reproduce the bug.

1. have an address with enough funds as active address
2. run IOTA_IDENTITY_FUND_WITH_ACTIVE_ADDRESS=true cargo test -- --test-threads=1 (or limit it to a specific test, that does on-chain interaction)

Expected behaviour

Tests complete successfully.

Actual behaviour

Test(s) fail with an error, that new test account does not have enough funds.

Errors

Error: issue with gas for transaction: issue with gas for transaction: no coin found with minimum required balance of 1000000000 for address 0x07f654ac8afe131cfebe8ff0b094591def1b26fa690d769ee98e59270b9caebf