Image on PDF not show

[xf1987]

The download version is V1.16.0，my system version with iOS 11，but images on PDF not show.
iOS9 and iOS10 has same problem，iOS12 and iOS13 can display normal.
So, Why？

<WKWebView source={{ uri: this.props.webUrl }} style={styles.webView} scalesPageToFit startInLoadingState allowsLinkPreview />