Function in a library is not listed in the ABI output

Solc version: 0.8.29
Description：Why does the function **integer** have ABI information, but the function **stru** does not?

```solidity
library L {
struct S { uint x; }
function integer(uint t, bool b) public view returns (uint) {
if (b) {
return t;
} else {
revert("failure");
}
}
function stru(S storage t, bool b) public view returns (uint) {
if (b) {
return t.x;
} else {
revert("failure");
}
}
}
```
```
[
{
"inputs": [
{
"internalType": "uint256",
"name": "t",
"type": "uint256"
},
{
"internalType": "bool",
"name": "b",
"type": "bool"
}
],
"name": "integer",
"outputs": [
{
"internalType": "uint256",
"name": "",
"type": "uint256"
}
],
"stateMutability": "view",
"type": "function"
}
]
```

No source file, test, or entry point is named. Reproduce the supplied library with solc 0.8.29, then trace ABI generation for public library functions with storage-struct parameters and compare it with integer; done means the missing stru ABI behavior is explained and corrected, with coverage for this case.

Written by the indexing model from the issue text.